Means for adjusting shafts



G. F. BULL MEANS FOR ADJUSTING SHAFTS 3 Sheets-Shee't 1 Filed June 2, 1,922

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(5; F. BULL MEANS NOR ADJUSTING SHAFTS Filed June 2, 1922 3 Sheets-Sheet 2 e0 19 21 fl 13 o 9 19 g /Q0 ea 15 M 12' no i r 11 49 20 10 Qj V 21 ve/afar QegggIfBwZfi G. F. BULL MEANS FOR ADJUSTING SHAFTS Filed June 2, 1922 5 sheets-Sheet 3 Ryan %or eoage Z7 B z Z/ Patented 3%, i924.

GEORGE BULL, B173;

'GHK'EIES H.

rarest critics...

EZII HQAIYI, ENGLAND, ASSIG'NDR GE UTE- HALE T6 E33, BIHMINGEIAIFL, ENGLAND.

ZLVIEHNS HUB ADJUSTEN SEIA'EFTS.

fxpplication =fi1ed June 2, 19 22. N0. 5625, 112.

' mitted from the driving shaft to the driven shaft through the intern'iediary of the lay shaft, the arrangement being such that the respective planes of the centres of the driving shaft and lay shaft, and lay shaft and driven shaft are angularly disposed relatively to each other.

The object of this invention is to provide improved means for the purpose above referred to.

According to this invention 1 provide improved means for adjusting shafts comprising a pair of eccentrics mounted one within the other and arranged to adjust either the shaft itself or a member carrying the same.

Figure 1 is a side elevation of a powerdriven lawn-mower to which my invention is applied.

Figure 2 is a part sectional plan thereof.

Figure is a front elevation of one of the rocking members detached, showing the eccentrics in one position, and

Figure 4 is a similar view showing one of the eccentrics moved into another position.

Figures 5, 6 and 7 show the eccentrics detached, and in various positions relatively to each other.

In carrying out the invention it may be applied to shafts used for various purposes, but I will describe it by way of example as applied to the lay shaft of a power driven lawn mower such as shown in Figure 1. In this machine the power is transmitted from the engine "shaft 1 to the lay shaft 2 through the medium of chains 3 passing over sprocket wheels 1 mounted on the shafts and similarly from the lay shaft to the driven shaft 5., i. e., the shaft of the ground rollers 6 by means of chains 7. Thus by adjusting the lay shaft 2 the tension upon one or both sets of chains can re mired.

tion bearings 8 mounted in lions clearly shown at Figure The lay shaft 2 is journalled in anti-fric- (i ried pair of rocking members 10 tlltposed longitudinally of the machine, the

said housings being sprit and'adapt r to be contracted npon the outer racesof the bearings to hold same 1 .'nl.y in position as is 3 and i. Each of these longitudinal members is pro'viced adjacent one end thereof with an elongated slot-11 through which oue of the transverse tie rods 12-ofthe machine passes, the width the slot being equal to that of thetie-rod so that the said member is free to move longitudinally relatively to the tie-rod and also to pivot about the same Adjacent the opposite end of each longitudinal member a large circular transverse aperture 13 is disposed into which a circular boss 14 upon one face of a lever 15 fits, so that it is free to rotate therein. This boss has passing through same an eccentric circular passage into which fits a boss 16 upon one face of a second lever 17 so that this also is free to rotate. Passing through this latter boss is also an eccentric circular aperture of the same diameter as one of the fixed transverse tie-rods 18 of the machine which passes therethrough and supports the two eccentries so formed, and thus the end of the rocking member 10 carried thereby.

The two eccentrics 1d and 16 revolve around the said tie rod 18 and are arranged relatively to each other so that by moving one lever the rocking member 10 is moved endwise, and by moving the other lever it rocked about the tie-rod 12 passing through the aforesaid elongated slot 11. Thus by a combination of the two movements the shaft 2 carried by the rocking member 10 can be moved into any position so hat the tension on one or both of the chains 6 and 7 can be adjusted.

To lock the rocking members 10 in adjusted positions washers 19 are pro. i'ipon one or both sides of the eccentrics. these washers being pressed against same by means of distance sleeves 20 under the influence of nuts 21 screwed on to the ends of the tie-rods 12 and 18.

It will be understood that the above application is only given way of example andthat the invention is equally applicable to the adjustment of various shafts used for other purposes.

Having fullyhdescribed my invention what I desire to claim and secure by Letters Patent is g V i 1. Means for ad ust-mg a shaft, comprising two fixed members, a pair of eccentrics rotatable one within the other and upon one ofthe fixed members, and a shaft carrying member supported by the eccentrics and the other fixed member and adapted for angular movement about and longitudinal movement relative to the latter fixed member.

2. Means for adjusting a shaft, comprising two fixed members, an eccentric roj tatably mounted upon one of the fixed members, a second eccentric having ahousing within which the first eccentric is rotatably mounted, a shaft-carrying member having 7 a housing within which the second eccentric 1s mounted'torotate for supporting said shaft carrying member at one point, the said shaft-carrying member being supported at another point by the second fixed member for angular movement about and longitudinal movement relative to the latter fixed 'member.

through the said aperture and" supporting the eccentrics, and means for rotating the said eccentrics 'in order to move the said member in the required direction' In testimony whereof he has hereunto set hls hand in presence of two subscribing witnesses. 3 V V GEORGE FREDERICK BULL} Witnesses S. SKERRETT,

W. N. SKERRETT. v I .7 o 1 f 1 

